.top-content {
    margin-top: 20px;
    margin-bottom: 20px;
}

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

body {
    background-color: #F4F4F4;
}

.bg-color-white {
    background-color: #ffffff;
}

.inline-block {
    display: inline-block;
}

.main-block {
    margin-top: 50px;
    clear: left;
}

@media (max-width: 768px) {
    .publish-message {
        margin-top: 20px;
    }
}

.teacher-block {
    width: 100%;
    margin: 10px 10px 10px 10px;
    padding: 0 5px 0 5px;
}

.avatar-block {
    width: 100px;
    height: 100px;
    float: left;
    padding: 5px 5px 5px 5px;
}

.avatar-big {
    width: 200px;
}

.avatar-in-list {
    width: 72px;
}

.teacher-content {
    margin-left: 100px;
    padding: 5px 0 5px 0;
}

footer {
    margin-top: 100px;
    text-align: center;
}

footer p {
    font-size: 12px;
}

.debug {
    border: 1px solid darkgreen;
}

.avatar {
    width: 100px;
    height: 100px;
}

.menu-active {
    background-color: #B2B3B3;
}

.teacher-info {
    font-size: 14px;
    color: #7f7f7f;
    margin-bottom: 6px;
}

.jiajiao-logo {
    width: 100px;
}

.relative-free-btn {
    position: fixed;
    right: 40px;
    top: 500px;
}